Just started trig, please show step by step. 1> cos 19pi / 12 using Half-Angle Identites 2> cos 165* using Half-Angle Identites any help would be greatly appreciated!
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Originally Posted by Daniels4691 Just started trig, please show step by step. 1> cos 19pi / 12 using Half-Angle Identites 2> cos 165* using Half-Angle Identites any help would be greatly appreciated! in addition to the half-angle identity, you need the folowing information ... is in quadrant IV, which tells you the sign of the cosine value. is half of is coterminal with , which means their respective cosine values are the same. is a unit circle value.
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